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PostgreSQL 10 Administration Cookbook - Fourth Edition
book

PostgreSQL 10 Administration Cookbook - Fourth Edition

by Simon Riggs, Gianni Ciolli
May 2018
Intermediate to advanced content levelIntermediate to advanced
576 pages
30h 25m
English
Packt Publishing
Content preview from PostgreSQL 10 Administration Cookbook - Fourth Edition

How it works…

If you want to move a table and its indexes all in one pass, you can issue all the commands in a single transaction, as follows:

BEGIN;ALTER TABLE mytable SET TABLESPACE new_tablespace;ALTER INDEX mytable_val1_idx SET TABLESPACE new_tablespace;ALTER INDEX mytable_val2_idx SET TABLESPACE new_tablespace;COMMIT;

Moving tablespaces means bulk copying of data. Copying happens sequentially, block by block. That works well, but there's no way to avoid the fact that the bigger the table, the longer it will take.

Performance will be optimized if archiving or streaming replication is not active, as no WAL will be written in that case.

You should be aware that the table is fully locked (the AccessExclusiveLock lock) while the copy is taking ...

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Publisher Resources

ISBN: 9781788474924Supplemental Content